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Local field enhancements in metallic nanostructures enable the study of various highly nonlinear optical processes in nanoscopic volumes. In this talk, the prominent examples of strong-field photoemission and extreme ultraviolet light generation will be discussed.
In this presentation we show that the recently discovered nonlocal optical behaviour of plasmonic nanorod metamaterials enables an enhanced, ultrafast, and nonlinear optical response of this hyperbolic structure. In particular, a large (80%) change of transmission through this subwavelength thick slab of metamaterial subjected to a low control light fluence of 7 mJ/cm2, is observed when the conditions...
Plasmons in strongly coupled nanostructures can induce strong electric fields and enhance electron transfer processes. A quantum mechanical description of this process reveals several novel effects that would be absent in classical modeling.
We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
The SHG in nonelectrically poled NLO polymers was investigated at Surface Plasmon resonance. The SHG conversion efficiency in the polymer-coated Ag films was more than 10 times as high as that in the non-coated ones.
We study, both theoretically and experimentally, emission of correlated photon-pairs by spontaneous four-wave-mixing in silicon integrated resonators. We show that the number of generated pairs in the quantum experiment is predicted by a classical experiment.
We experimentally demonstrate a 10 times enhancement to the coincidence-to-accidental ratio of a correlated photon-pair source from a chalcogenide Ge11.5As24Se64.5 nanowire. This improvement is enabled by the low-Raman window of the device.
Two-dimensional coherent spectroscopy on a series of quantum dot samples with different morphology reveals that biexciton binding is independent of the details of confinement in InAs dots, in contrast to the behavior in GaAs dots.
We demonstrate experimentally an optical event horizon in a waveguide structure akin to a hydrodynamic Laval nozzle. The event horizon which forms at the nozzle throat is suggested as a platform for analog gravity experiments.
We report on our experimental progress towards observing weak-value amplification of low-light-level cross-phase modulation which will be the first observation of a weak measurement relying on true entanglement between distinct systems.
We demonstrate soliton mode-locking in continuously pumped, non-linear optical MgF2 microresonators, resulting in low noise frequency comb spectra and ultra-short pulses of 200 fs duration with a repetition rate of 35.2 GHz.
We theoretically demonstrate that if pump powers are kept low enough to suppress multi-pair events in integrated photon pair generation via spontaneous four-wave mixing, many other nonlinear effects are often also constrained to negligible levels.
We compare an analog and a digital method for characterizing the long-distance non-line-of-sight ultraviolet scattering channel. Experimental results and theoretical-model predictions are presented that provide demonstration and validation.
Near bandwidth-limited 7-fs-pulses were delivered at the foci of high-NA objectives by employing broadband mirrors for dispersion compensation. The impact of 7-fs-pulses on the signal generation efficiency and contrast in nonlinear optical imaging was investigated.
By means of doping the initial dissolved polymer, we have successfully fabricated optical-quality graphene-doped polymer nanofibers by a physical drawing technique. Using a waveguiding scheme, single graphene-doped polymer nanofibers exhibit broadband saturable absorbance (transmission change∼10%).
We present the latest results in extending dual-comb spectroscopy to two-photon resonances. By measuring two-photon excitation of rubidium vapor and water-dissolved fluorophores, we demonstrate both the high resolution and speed of the technique.
The high repetition rate laser systems providing the ELI-ALPS facility with TW-to-PW peak intensity pulses are designed to generate secondary light sources with a duration of tens of attosecond for basic and applied researches.
We analyzed the enhancement of the forward Brillouin gain in a silicon slot waveguide. The calculations predict a gain of 3.6 × 105 W−1m−1, which is an order of magnitude larger than in a silicon wire.
Single mode anomalous dispersion As2S3 on Er doped TeO2 waveguides with near zero propagation loss under 1475nm pumping are demonstrated. Fully lossless waveguides with high nonlinear coefficient can be achieved with higher 1480nm pump power.
The optical nonlinearities of the chalcogenide Ge28Sb12Se60 are studied using the z-scan technique with femtosecond and picosecond laser pulses at 1.0 μm. Results indicate this glass shows promise for nonlinear optical waveguide devices.
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